Docs-only; no output change, no golden moves (selfcheck 161,300/161,300 green before and after).
THE DRIFT THIS CLOSES. Three gig-layer behaviour changes had reached only my lane notes, never the
spec — the amendment law says the spec is where they live:
- ROUND20 ledger #2: the R16 facade-clearance bias WIDENED from band_room/rsl to every venue kind (line
312 still claimed band_room/rsl). A real road graph at E's density can put a PUB's facade over a cross
street; synthetic pubs always clear, so it stayed a no-op there.
- ROUND21 ledger #1: the venue cluster bias was never written down at all. Now recorded with the
measurement (11 of 15 venues under the floor -> 0; Newtown's RSL 2,228m -> 29m from the hub) and the
by-construction gate (, which synthetic never sets — measured, not assumed).
- ROUND22 ledger #2: the graded fallback (densest-available where the floor is unreachable).
Also documented the pick ORDER, which no lane could have inferred: cluster field -> kind flavour ->
clearance filter -> farthestFirst -> seeded pick, each degrading to the previous set.
CITY_SPEC v4 section marked FINAL at the tag: the alpha's five towns became the epoch's 23 (1,210
shops) and every ruling held with no new hardening. 'All five towns' now reads as the measurement of
record when the ruling was written; the ruling is pack-wide.
THE RISK LIST, line by line, judged against the full pack rather than the 5-town sample it was written
for (V4_REAL_MAP.md):
1. RETIRED — bbox law enforced with headroom: widest is geelong at 3,829m, 77% of the 5km ceiling.
2. RETIRED — the floor never bound: thinnest is darwin at 12 shops, 2x MIN_TOWN_SHOPS. (Whether 12
shops READS alive is D's thin-tail check, not a generator risk — different question, still live.)
3. RETIRED plan-side; CARRIED for the runtime lanes. The alpha's real risk paid off exactly as
intended (it surfaced fragmentation, capacity, stranding — each fixed-or-fenced). But a green plan
is not a green town: C's soak, D's fitzroy audit and F's matrix are the verifies that close it.
4. RETIRED — the DP knob is at a measured setting: 1 component on all 23.
5. Unchanged, now on 23 towns not 5.
6. NEW, CARRIED — thin-graph seating capacity: 6.4% of shops don't seat (77/1,210), all counted by
cause; daylesford 19% (32 shops on 171 roads), fitzroy 13%. Levers are spent at RGAP 0.5m /
NODE_CLEAR 3m; the only one left puts a shop on a road it isn't on. R20 ruling stands: drop and
count beats teleport. Carried into v4.x measured, not hidden.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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